Discussion
A digital multimeter normally uses :
Answer: D
A digital multimeter normally uses a dual slope ADC (spelt 'Duel' in the paper).
The dual slope converter integrates the input for a fixed time, then measures how long a reference voltage takes to integrate back to zero. Because the result depends on a ratio of times, it is insensitive to drift in the integrator components, and integrating over a whole number of mains cycles rejects 50 Hz hum. It is slow, but a multimeter needs only a few readings a second, so accuracy and noise rejection matter more.
Flash ADCs are very fast but costly and of low resolution, used for video and oscilloscopes. Counter and successive approximation ADCs are faster than dual slope but do not average out noise in the same way.
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